EP0997247B1 - Matrice d'extrusion pour la fabrication de corps en nid d'abeilles - Google Patents

Matrice d'extrusion pour la fabrication de corps en nid d'abeilles Download PDF

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Publication number
EP0997247B1
EP0997247B1 EP99308568A EP99308568A EP0997247B1 EP 0997247 B1 EP0997247 B1 EP 0997247B1 EP 99308568 A EP99308568 A EP 99308568A EP 99308568 A EP99308568 A EP 99308568A EP 0997247 B1 EP0997247 B1 EP 0997247B1
Authority
EP
European Patent Office
Prior art keywords
die
slit
axis
open ends
taper portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99308568A
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German (de)
English (en)
Other versions
EP0997247A3 (fr
EP0997247A2 (fr
Inventor
Makoto Miyazaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NGK Insulators Ltd
Original Assignee
NGK Insulators Ltd
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Filing date
Publication date
Application filed by NGK Insulators Ltd filed Critical NGK Insulators Ltd
Publication of EP0997247A2 publication Critical patent/EP0997247A2/fr
Publication of EP0997247A3 publication Critical patent/EP0997247A3/fr
Application granted granted Critical
Publication of EP0997247B1 publication Critical patent/EP0997247B1/fr
Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
    • B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
    • B28B3/26—Extrusion dies
    • B28B3/269—For multi-channeled structures, e.g. honeycomb structures

Definitions

  • the present invention relates to a die for manufacturing honeycomb bodies used for extruding honeycomb structural bodies.
  • various kinds of dies for manufacturing honeycomb bodies which comprise; a die main body including batch supply holes which are opened to a backside surface of the die, slit channels which are communicated with the batch supply holes and are opened to a foreside surface of the die and a taper worked portion which is formed by working an outer peripheral portion of the foreside surface of the die in a taper manner; and a control plate arranged at a portion opposed to the taper worked portion.
  • Fig. 4 is a schematic view showing one embodiment of a known die for manufacturing honeycomb bodies.
  • a die 51 for manufacturing honeycomb bodies comprises a die main body 52 and a control plate 53.
  • the die main body 52 has a disk-shape and comprises batch supply holes 61 which are opened to its backside surface (lower surface (not shown) in Fig. 4) and slit channels 62 which are opened to its foreside surface (upper surface in Fig. 4).
  • the slit channels 62 have a crisscross shape at the foreside surface of the die main body 52, and the batch supply holes 61 are communicated with alternate intersection points.
  • An outer peripheral portion of the die main body 52 is worked into a taper shape to form a taper worked portion 63.
  • the control plate 53 is connected to the die main body 52 via a spacer 64 in such a manner that one surface 53a is opposed (parallel in Fig. 4) to the taper worked portion 63.
  • a ceramic batch for example is supplied from the batch supply holes 61 which are opened to the backside surface of the die 51, and the thus supplied ceramic batch is extruded from the slit channels 62 which are opened to the foreside surface of the die 51, so as to obtain a honeycomb structural body. Then, it is possible to reduce an inward batch stress when an outer wall is formed and to prevent a collapsing of outer cells i.e. a generation of wrinkle portions in the honeycomb structural body by forming the taper worked portion 63 at the outer peripheral portion of the die main body 52 and by arranging the control plate 53 at a portion opposed to the taper worked portion 63.
  • US 4349329 teaches an extrusion due having grid-shaped extrusion slots and a die mask which covers the outer peripheral portion of the die on the extrudable material outlet side.
  • the extrusion slots at the periphery of the uncovered area are tapered outwardly towards their open ends.
  • a pooling zone is provided in the covered area to provide extrudable material to the uncovered slots.
  • An object of the invention is to eliminate the drawbacks mentioned above and to provide a die for manufacturing honeycomb bodies in which a rib strength can be improved and a generation of wrinkle portions at an outer portion, which is a fatal defect of a thin honeycomb body, can be prevented.
  • the slit channel expanding portions having the construction mentioned above are arranged at a predetermined portion of the slit channels existing in the taper worked portion of the outer peripheral portions, a larger amount of batch can be supplied to the slit channel expanding portions as compared with that of the other portion, and thus the outermost ribs of the honeycomb structural body can be strengthened. Therefore, an isostatic strength of the honeycomb structural body can be improved even if the honeycomb structural body has a thin wall, and it is possible to prevent a generation of wrinkle portions at the outer portion.
  • Fig. 1 is a schematic view showing one embodiment of a die for manufacturing honeycomb bodies according to the invention.
  • a die 1 for manufacturing honeycomb bodies comprises a die main body 2 and a control plate 3.
  • the die main body 2 has a disk-shape and comprises batch supply holes 11 which are opened to its backside surface (lower surface (not shown) in Fig. 1) and slit channels 12 which are opened to its foreside surface (upper surface in Fig. 1).
  • the slit channels 12 have a crisscross shape at the foreside surface of the die main body 2, and the batch supply holes 11 are communicated with alternate intersection points.
  • An outer peripheral portion of the die main body 2 is worked into a taper shape to form a taper worked portion 13.
  • the control plate 3 is connected to the die main body 2 via a spacer 14 in such a manner that one surface 3a is opposed (parallel in Fig. 1) to the taper worked portion 13.
  • the construction of the die 1 for manufacturing honeycomb bodies according to the invention mentioned above is the same as that of the known die for manufacturing honeycomb bodies.
  • a different point between the die 1 according to the invention and the known die is that slit channel expanding portions are formed at open ends of the slit channels 12 existing in the taper worked portion 13 of the outer peripheral portion of the die main body 2.
  • the slit channel expanding portion 21 the slit channel 12 is expanded gradually toward an open end 12a.
  • the slit channel expanding portion 21 is formed by performing a C-chamfer working for the open end 12a of the slit channel 12.
  • the C-chamfer working can be performed by grinding the slit channel 12 by means of a whetstone which is set with a predetermined angle with respect to the open end 12a of the slit channel 12. Moreover, the slit channel expanding portion 21 is formed locally by a constant distance from the open end 12a of the slit channel 12.
  • the slit channel expanding portions 21 are arranged at a predetermined position, a larger amount of batch can be extruded from the slit channels 12, in which the slit channel expanding portions 21 are arranged, as compared with the slit channels 12 in which no slit channel expanding portions 21 are arranged.
  • the batch extruded from the slit channel expanding portions 21, whose amount is larger than that of the other portion, is contacted to the control plate 2 and then integrated inwardly.
  • the honeycomb structural body after forming it is possible to strengthen the ribs existing the outer peripheral portion thereof.
  • Figs. 2a and 2b One example is shown in Figs. 2a and 2b. Fig.
  • Fig. 2 shows a part of the honeycomb structural body extruded by using the known die for manufacturing honeycomb bodies.
  • Fig. 2b illustrates a part of the honeycomb structural body extruded by using the die 1 for manufacturing honeycomb bodies according to the invention. The following is understood from a comparison between Fig. 2a and Fig. 2b.
  • reinforced portions 33 are formed at connecting portions between ribs 31 and an outer wall 32 and thus an isostatic strength of the honeycomb structural body can be improved.
  • the wrinkle portions are not generated at the outer portion.
  • the slit channel expanding portion 21 is formed by performing a C-chamfer on the open end 12a of the slit channel 12.
  • This C-chamfer working can form the slit channel expanding portions 21 at an easiest manner.
  • the present invention is not limited to the C-chamfer working and it is possible to use other working methods if they can expand the slit channel 12 as mentioned above.
  • materials of the die main body 2, the control plate 3 and the spacer 14 are not explained, but it is a matter of course that the same materials used in the known die such as stainless can be used.
  • ceramic honeycomb structural bodies made of cordierite as a main ingredient, having a dimension of diameter: 103 mm, length: 100 mm, wall thickness: 75 ⁇ m (3 mil), cell number: 62 cells per square centimetre (400 cpsi) were extruded by using dies according to a comparative example and examples 1-2 to form ceramic honeycomb structural bodies. Then, with respect to the thus formed ceramic honeycomb structural bodies, ISO (isostatic) strengths in a radial direction were measured and compared.
  • ISO isostatic
  • the slit channel expanding portions having the construction mentioned above are arranged at a predetermined portion of the slit channels existing in the taper worked portion of the outer peripheral portions, a larger amount of batch can be supplied to the slit channel expanding portions as compared with that of the other portion, and thus the outermost ribs of the honeycomb structural body can be strengthened. Therefore, an isostatic strength of the honeycomb structural body can be improved even if the honeycomb structural body has a thin wall, and it is possible to prevent a generation of wrinkle portions at the outer portion.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)

Claims (4)

  1. Matrice (1) pour la fabrication de corps de nids d'abeilles comprenant :
    un corps principal de matrice (2) comportant des trous d'alimentation discontinue (11) qui s'ouvrent sur une surface arrière de la matrice (1) ;
    des gorges fendues (12) en communication avec les trous d'alimentation discontinue (11) et ouverts sur une surface avant de la matrice (1) ;
    une portion conique (13) formant une partie périphérique externe de la surface avant de la matrice (1) de manière conique ; et
    une pla que de commande (3) placée dans une position opposée à la portion conique (13) ;
       caractérisée en ce que :
    les gorges fendues (12) s'ouvrant dans la portion conique (13) comportent des portions de dilatation de gorges fendues (21) formées à leurs extrémités ouvertes (12a) de telle manière que les gorges fendues (12) se dilatent graduellement vers leurs extrémités ouvertes (12a).
  2. Matrice (1) pour la fabrication de corps de nids d'abeilles selon la revendication 1, dans laquelle chacune desdites portions de dilatation de gorges fendues (21) est un chanfrein en forme de C aux extrémités ouvertes de la gorge fendue (12).
  3. Matrice (1) pour la fabrication de corps de nids d'abeilles selon la revendication 2, dans laquelle :
    les gorges fendues (12) ont une forme entrecroisée sur la surface avant du corps principal de matrice (2), la direction des lignes de l'entrecroisement définissant respectivement un axe X et un axe Y ; et
    lesdites portions de dilatation de gorges fendues (21) sont prévues aux extrémités ouvertes de toutes les gorges fendues (12) s'ouvrant dans la portion conique (13) et s'étendant le long de l'axe X et aux extrémités ouvertes de toutes les gorges fendues (12) s'ouvrant dans la portion conique (13) et s'étendant le long de l'axe Y.
  4. Matri ce (1) pour la fabrication de corps de nids d'abeilles selon la revendication 2, dans laquelle :
    les gorges fendues (12) ont une forme entrecroisée sur la surface avant du corps principal de matrice (2), la direction des lignes de l'entrecroisement définissant respectivement un axe X et un axe Y ; et
    lesdites portions de dilatation de gorges fendues (21) sont prévues dans différentes régions circonférentielles respectives (41, 42, 43) de la portion conique , (a) aux extrémités ouvertes uniquement des gorges fendues (12) s'ouvrant dans la portion conique (13) e t s'étendant le long de l'axe X, (b) aux extrémités ouvertes uniquement des gorges fendues (12) s'ouvrant dans la portion conique (13) et s'étendant le long de l'axe Y, et (c) aux extrémités ouvertes des gorges fendues (12) s'ouvrant dans la portion conique (13) et s'étendant le long de l'axe X et aux extrémités ouvertes des gorges fendues (12) s'ouvrant dans la portion conique (13) et s'étendant le long de l'axe Y.
EP99308568A 1998-10-29 1999-10-28 Matrice d'extrusion pour la fabrication de corps en nid d'abeilles Expired - Lifetime EP0997247B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP30880298A JP3701801B2 (ja) 1998-10-29 1998-10-29 ハニカム製造用口金
JP30880298 1998-10-29

Publications (3)

Publication Number Publication Date
EP0997247A2 EP0997247A2 (fr) 2000-05-03
EP0997247A3 EP0997247A3 (fr) 2002-05-29
EP0997247B1 true EP0997247B1 (fr) 2004-08-18

Family

ID=17985495

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99308568A Expired - Lifetime EP0997247B1 (fr) 1998-10-29 1999-10-28 Matrice d'extrusion pour la fabrication de corps en nid d'abeilles

Country Status (4)

Country Link
US (1) US6287103B1 (fr)
EP (1) EP0997247B1 (fr)
JP (1) JP3701801B2 (fr)
DE (1) DE69919483T2 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002283326A (ja) * 2001-03-28 2002-10-03 Ngk Insulators Ltd ハニカム構造体成形装置及び成形方法
JP4210446B2 (ja) 2001-09-19 2009-01-21 日本碍子株式会社 ハニカム押出成形用口金及びその製造方法
WO2004073969A2 (fr) * 2003-02-18 2004-09-02 Corning Incorporated Corps alveolaire ceramique et procede de fabrication
US7112050B2 (en) * 2003-06-26 2006-09-26 Corning Incorporated Extrusion die for making a double-skin honeycomb substrate
US7914724B2 (en) 2005-07-29 2011-03-29 Corning Incorporated Methods for extruding a honeycomb article with a skin surrrounding a central cellular structure
KR100855167B1 (ko) * 2005-11-18 2008-08-29 이비덴 가부시키가이샤 벌집형 구조체
CN100560180C (zh) * 2005-11-18 2009-11-18 揖斐电株式会社 蜂窝结构体
EP2127836B1 (fr) * 2007-02-01 2013-12-11 NGK Insulators, Ltd. Matrices pour la formation par extrusion d'un corps formé en nid d'abeille et procédé de formation du corps formé en nid d'abeille utilisant lesdites matrices
US9089992B2 (en) 2007-04-30 2015-07-28 Corning Incorporated Methods and apparatus for making honeycomb structures with chamfered after-applied akin and honeycomb structures produced thereby
US20100052205A1 (en) * 2008-08-27 2010-03-04 Thomas William Brew Method of forming ceramic honeycomb substrates
US8435025B2 (en) * 2009-08-27 2013-05-07 Corning Incorporated Honeycomb extrusion die apparatus
US20110126973A1 (en) * 2009-11-30 2011-06-02 Andrewlavage Jr Edward Francis Apparatus And Method For Manufacturing A Honeycomb Article
JP6196604B2 (ja) * 2014-11-18 2017-09-13 日本碍子株式会社 ハニカム成形体の押出成形用口金
EP3414067B1 (fr) 2016-02-11 2022-06-15 Corning Incorporated Composants d'extrusion de corps alvéolaires
WO2021108207A1 (fr) * 2019-11-26 2021-06-03 Corning Incorporated Filière d'extrusion en nid d'abeilles pourvue d'un relief de gonflement

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55140514A (en) * 1979-04-21 1980-11-04 Ngk Insulators Ltd Preparation of mouth piece for extruding and molding honeycomb molding earth discharging foundation
JPS5838083B2 (ja) * 1980-01-22 1983-08-20 株式会社日本自動車部品総合研究所 ハニカム構造体押出成形用ダイス装置
US4298328A (en) * 1980-05-12 1981-11-03 Corning Glass Works Extrusion apparatus for preventing the distortion of peripheral cells in extruded honeycomb structures
JPS5777521A (en) * 1980-10-31 1982-05-14 Nippon Soken Die device for molding honeycomb structure
JPS57157706A (en) * 1981-03-25 1982-09-29 Nippon Soken Die for molding honeycomb
US5256054A (en) * 1990-11-30 1993-10-26 Corning Incorporated Method and apparatus for forming a uniform skin on a cellular substrate
US5089203A (en) * 1991-02-12 1992-02-18 Corning Incorporated Method and apparatus for forming an outer skin or honeycomb structures
JPH08169005A (ja) * 1994-12-20 1996-07-02 Babcock Hitachi Kk ハニカム成形用口金およびハニカム成形体の製造方法

Also Published As

Publication number Publication date
JP3701801B2 (ja) 2005-10-05
US6287103B1 (en) 2001-09-11
JP2000127130A (ja) 2000-05-09
DE69919483T2 (de) 2005-09-29
DE69919483D1 (de) 2004-09-23
EP0997247A3 (fr) 2002-05-29
EP0997247A2 (fr) 2000-05-03

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